Argon Triple Point for Long-Stem SPRTs: Thermal Behavior

Dobre, M.; Didialaoui, I.; Hermier, Y.

doi:10.1007/s10765-011-1039-2

Cited by 2 publications

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“…The predominant contribution to the uncertainty in the difference is due to the variability of the Ar-IMGC system. This could be attributed to the influence of atmospheric-pressure variations or heat flux variations along thermometric well, as pointed out by other authors [3][4][5].…”

Section: Discussionmentioning

confidence: 59%

“…In most European metrology institutes its realization is still based on the device designed by BNM-INM in 1975 [2,3]. This system is reliable and easy to use which has made it famous and operational all over the world for many years although some improvements have been proposed over time to overcome some of its inconveniences such as the influence of atmospheric-pressure variations and the change in hydrostatic pressure [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Realisation of the triple-point of Argon: comparison between two devices

Lopardo,

Dematteis,

Steur

2024

Phys. Scr.

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A new cryostat for the realization of the triple-point of the argon (83.8058 K), a defining fixed point of the International Temperature Scale of 1990 (ITS-90), was acquired at Italian National Metrological Institute (INRiM). The new system, manufactured by Fluke, is intended to substitute the current National reference, a model developed at BNM-INM in the 1975. The main difference between the two system is in the way to control the temperature. In the BNM-INM device the temperature is controlled adjusting the pressure of liquid nitrogen bath, in the Fluke system instead, an electrical heater wrapped around the argon cell is used, following cryogenic practice. This paper describes the result of the direct comparison and shows typical phase transitions obtained with the two argon systems. Then, a complete uncertainty budget is evaluated for the new Fluke system and compared with the National standard.

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Section: Discussionmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Realisation of the triple-point of Argon: comparison between two devices

Lopardo,

Dematteis,

Steur

2024

Phys. Scr.

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Argon Triple-Point Device for Calibration of SPRTs

Kołodziej¹,

Manuszkiewicz²,

Szmyrka-Grzebyk³

et al. 2014

Int J Thermophys

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This paper presents an apparatus for the calibration of long-stem platinum resistance thermometers at the argon triple point (T 90 = 83.8058 K), designed at the Institute of Low Temperature and Structural Research, Poland (INTiBS). A hermetically sealed cell filled at the Istituto Nazionale di Ricerca Metrologica, Italy with high purity gas (6N) is the main element of this apparatus. The cell is placed in a cryostat fully immersed in liquid nitrogen. A temperature-controlled shield ensures the quasi-adiabatic condition needed for proper realization of the phase transition. A system for correcting the temperature distribution along the thermometer well is also implemented. The cell cooling and argon solidification is carried out by filling the thermometer well with liquid nitrogen. A LabVIEW computer program written at INTiBS automatically controls the triple-point realization process. The duration of a melting plateau in the apparatus lasts for about 24 h. The melting width for F between 20 % and 80 % was <0.3 mK. The reproducibility of the plateau temperature is better than ±20 µK.

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Argon Triple Point for Long-Stem SPRTs: Thermal Behavior

Cited by 2 publications

References 0 publications

Realisation of the triple-point of Argon: comparison between two devices

Realisation of the triple-point of Argon: comparison between two devices

Argon Triple-Point Device for Calibration of SPRTs

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